chore(deps): update actions/checkout action to v2

Author: renovate-bot

.github/workflows/continuous-deployment-workflow.yml

@@ -7,7 +7,7 @@ jobs:
     name: Publish to NPM
     runs-on: ubuntu-latest
     steps:
-      - uses: actions/checkout@v1
+      - uses: actions/checkout@v2
       - uses: actions/setup-node@v1
         with:
           registry-url: https://registry.npmjs.org

.github/workflows/continuous-integration-workflow.yml

@@ -5,7 +5,7 @@ jobs:
     name: Linters
     runs-on: ubuntu-latest
     steps:
-      - uses: actions/checkout@v1
+      - uses: actions/checkout@v2
       - uses: actions/setup-node@v1
       - run: npm ci --ignore-scripts
       - run: npm run prettier:check
@@ -18,7 +18,7 @@ jobs:
         node-version: ['10.x', '12.x', '14.x']
       fail-fast: false
     steps:
-      - uses: actions/checkout@v1
+      - uses: actions/checkout@v2
       - name: Setting up Node.js (v${{ matrix.node-version }}.x)
         uses: actions/setup-node@v1
         with:
@@ -29,7 +29,7 @@ jobs:
     name: Build
     runs-on: ubuntu-latest
     steps:
-      - uses: actions/checkout@v1
+      - uses: actions/checkout@v2
       - uses: actions/setup-node@v1
       - run: npm ci --ignore-scripts
       - run: npm run build:es2015